/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.kafka.streams.state.internals;

import org.apache.kafka.common.metrics.Metrics;
import org.apache.kafka.common.serialization.Serdes;
import org.apache.kafka.common.serialization.Serializer;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.streams.processor.internals.MockStreamsMetrics;
import org.apache.kafka.test.MockProcessorContext;
import org.apache.kafka.test.NoOpRecordCollector;
import org.apache.kafka.test.SegmentedBytesStoreStub;
import org.apache.kafka.test.TestUtils;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

public class ChangeLoggingSegmentedBytesStoreTest {

    private final NoOpRecordCollector collector = new NoOpRecordCollector() {
        @Override
        public <K, V> void send(final String topic,
                                K key,
                                V value,
                                Integer partition,
                                Long timestamp,
                                Serializer<K> keySerializer,
                                Serializer<V> valueSerializer) {
            sent.put(key, value);
        }
    };
    private final MockProcessorContext context = new MockProcessorContext(
        TestUtils.tempDirectory(),
        Serdes.String(),
        Serdes.Long(),
        collector,
        new ThreadCache("testCache", 0, new MockStreamsMetrics(new Metrics())));

    private final SegmentedBytesStoreStub bytesStore = new SegmentedBytesStoreStub();
    private final ChangeLoggingSegmentedBytesStore store = new ChangeLoggingSegmentedBytesStore(bytesStore);
    private final Map sent = new HashMap<>();

    @SuppressWarnings("unchecked")
    @Before
    public void setUp() throws Exception {
        context.setTime(0);
        store.init(context, store);
    }

    @After
    public void after() {
        context.close();
        store.close();
    }

    @SuppressWarnings("unchecked")
    @Test
    public void shouldLogPuts() throws Exception {
        final byte[] value1 = {0};
        final byte[] value2 = {1};
        final Bytes key1 = Bytes.wrap(value1);
        final Bytes key2 = Bytes.wrap(value2);
        store.put(key1, value1);
        store.put(key2, value2);
        store.flush();
        assertArrayEquals(value1, (byte[]) sent.get(key1));
        assertArrayEquals(value2, (byte[]) sent.get(key2));
    }

    @SuppressWarnings("unchecked")
    @Test
    public void shouldLogRemoves() throws Exception {
        final Bytes key1 = Bytes.wrap(new byte[]{0});
        final Bytes key2 = Bytes.wrap(new byte[]{1});
        store.remove(key1);
        store.remove(key2);
        store.flush();
        assertTrue(sent.containsKey(key1));
        assertTrue(sent.containsKey(key2));
        assertNull(sent.get(key1));
        assertNull(sent.get(key2));
    }

    @Test
    public void shouldDelegateToUnderlyingStoreWhenFetching() throws Exception {
        store.fetch(Bytes.wrap(new byte[0]), 1, 1);
        assertTrue(bytesStore.fetchCalled);
    }

    @Test
    public void shouldFlushUnderlyingStore() throws Exception {
        store.flush();
        assertTrue(bytesStore.flushed);
    }

    @Test
    public void shouldCloseUnderlyingStore() throws Exception {
        store.close();
        assertTrue(bytesStore.closed);
    }

    @Test
    public void shouldInitUnderlyingStore() throws Exception {
        assertTrue(bytesStore.initialized);
    }

}